1 files changed, 59 insertions, 0 deletions
diff --git a/vgasrc/bochsdisplay.c b/vgasrc/bochsdisplay.c
new file mode 100644
index 00000000..e1f90f96
--- /dev/null
+++ b/vgasrc/bochsdisplay.c
@@ -0,0 +1,59 @@
+#include "biosvar.h" // GET_BDA
+#include "output.h" // dprintf
+#include "string.h" // memset16_far
+#include "bochsvga.h" // VBE_BOCHS_*
+#include "hw/pci.h" // pci_config_readl
+#include "hw/pci_regs.h" // PCI_BASE_ADDRESS_0
+#include "vgautil.h" // VBE_total_memory
+
+#define FRAMEBUFFER_WIDTH      1024
+#define FRAMEBUFFER_HEIGHT     768
+#define FRAMEBUFFER_BPP        4
+#define FRAMEBUFFER_STRIDE     (FRAMEBUFFER_BPP * FRAMEBUFFER_WIDTH)
+#define FRAMEBUFFER_SIZE       (FRAMEBUFFER_STRIDE * FRAMEBUFFER_HEIGHT)
+
+int
+bochs_display_setup(void)
+{
+    dprintf(1, "bochs-display: setup called\n");
+
+    if (GET_GLOBAL(HaveRunInit))
+        return 0;
+
+    int bdf = GET_GLOBAL(VgaBDF);
+    if (bdf == 0)
+        return 0;
+
+    u32 bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_0);
+    u32 lfb_addr = bar & PCI_BASE_ADDRESS_MEM_MASK;
+    bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_2);
+    u32 io_addr = bar & PCI_BASE_ADDRESS_IO_MASK;
+    dprintf(1, "bochs-display: bdf %02x:%02x.%x, bar 0 at 0x%x, bar 1 at 0x%x\n"
+            , pci_bdf_to_bus(bdf) , pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf),
+            lfb_addr, io_addr);
+
+    u16 *dispi = (void*)(io_addr + 0x500);
+    u8 *vga = (void*)(io_addr + 0x400);
+    u16 id = readw(dispi + VBE_DISPI_INDEX_ID);
+    dprintf(1, "bochs-display: id is 0x%x, %s\n", id
+            , id == VBE_DISPI_ID5 ? "good" : "FAIL");
+    if (id != VBE_DISPI_ID5)
+        return 0;
+
+     dprintf(1, "bochs-display: using %dx%d, %d bpp (%d stride)\n"
+            , FRAMEBUFFER_WIDTH, FRAMEBUFFER_HEIGHT
+            , FRAMEBUFFER_BPP * 8, FRAMEBUFFER_STRIDE);
+
+    cbvga_setup_modes(lfb_addr, FRAMEBUFFER_BPP * 8,
+                      FRAMEBUFFER_WIDTH, FRAMEBUFFER_HEIGHT,
+                      FRAMEBUFFER_STRIDE);
+
+    writew(dispi + VBE_DISPI_INDEX_XRES,   FRAMEBUFFER_WIDTH);
+    writew(dispi + VBE_DISPI_INDEX_YRES,   FRAMEBUFFER_HEIGHT);
+    writew(dispi + VBE_DISPI_INDEX_BPP,    FRAMEBUFFER_BPP * 8);
+    writew(dispi + VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED);
+
+    writeb(vga, 0x20); /* unblank (for qemu -device VGA) */
+
+    return 0;
+}